fix(deps): update docusaurus monorepo to v3.9.1

Author: renovate-bot

docs/package.json

@@ -15,18 +15,18 @@
     "typecheck": "tsc"
   },
   "dependencies": {
-    "@docusaurus/core": "3.8.1",
-    "@docusaurus/preset-classic": "3.8.1",
+    "@docusaurus/core": "3.9.1",
+    "@docusaurus/preset-classic": "3.9.1",
     "@mdx-js/react": "^3.1.0",
     "clsx": "^2.0.0",
     "prism-react-renderer": "^2.4.0",
     "react": "^19.0.0",
     "react-dom": "^19.0.0"
   },
   "devDependencies": {
-    "@docusaurus/module-type-aliases": "3.8.1",
-    "@docusaurus/tsconfig": "3.8.1",
-    "@docusaurus/types": "3.8.1",
+    "@docusaurus/module-type-aliases": "3.9.1",
+    "@docusaurus/tsconfig": "3.9.1",
+    "@docusaurus/types": "3.9.1",
     "typescript": "~5.9.0"
   },
   "browserslist": {